The New Practical Navigator: Being a Complete Epitome of Navigation to which are Added All the Tables Requisite for Determining the Latitude and Longitude at Sea ...J. Johnson, 1807 - 328 sider |
Inni boken
Resultat 1-5 av 31
Side xv
... should have places of Decimals , then fo many cyphers must be affixed as there are places wanting . EXAMPLE I. Divide 208,125 by 7,5 . 7,5 ) 208,125 ( 27,75 EXAMPLE II . Divide 255,125 by 6,5 . 6,5 ) 255,125 ( 39,25 150 195 581 601 525 ...
... should have places of Decimals , then fo many cyphers must be affixed as there are places wanting . EXAMPLE I. Divide 208,125 by 7,5 . 7,5 ) 208,125 ( 27,75 EXAMPLE II . Divide 255,125 by 6,5 . 6,5 ) 255,125 ( 39,25 150 195 581 601 525 ...
Side 13
... should con- fift of three places of figures , the value of the third figure can only be gueffed at ; wherefore , in thefe fcales , it is better to use such a fcale as D , called a diagonal scale , by which any number of three figures ...
... should con- fift of three places of figures , the value of the third figure can only be gueffed at ; wherefore , in thefe fcales , it is better to use such a fcale as D , called a diagonal scale , by which any number of three figures ...
Side 22
... should .008215 = 7.91461 stand in the fecond decimal place , as the 3 in .031 , the index will be 8 ; if it ftood in the third decimal place , as .co31 , the index would be 7. Thus the number of cyphers pre- fixed to any decimal , and ...
... should .008215 = 7.91461 stand in the fecond decimal place , as the 3 in .031 , the index will be 8 ; if it ftood in the third decimal place , as .co31 , the index would be 7. Thus the number of cyphers pre- fixed to any decimal , and ...
Side 33
... should get per- fectly by Heart . - We shall here give the firft Axiom only , and the reft before we begin Oblique Sailing . AXIOM I. In any right - angled plane triangle , If the hypothenufe be made the radius of a circle , the other ...
... should get per- fectly by Heart . - We shall here give the firft Axiom only , and the reft before we begin Oblique Sailing . AXIOM I. In any right - angled plane triangle , If the hypothenufe be made the radius of a circle , the other ...
Side 73
... should be reckoned in a fixed latitude , and where the degrees are of the fame magnitude with those of the meridian , which can be no where but on the equator , where 60 geographical miles make a degree . The circumference of all ...
... should be reckoned in a fixed latitude , and where the degrees are of the fame magnitude with those of the meridian , which can be no where but on the equator , where 60 geographical miles make a degree . The circumference of all ...
Innhold
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Vanlige uttrykk og setninger
againſt alfo anchor Anfwer angle apparent altitude arch bafe bearing becauſe cable cafe centre Co-fecant co-fine Co-tang coaft column compafs confequently correfponding courfe courſe declination defcribe degrees departure difference of latitude difference of longitude Dift Dep Dift Lat diftance divifion draw eaft Epact equator EXAMPLE faid fame fathoms fecant fecond fextant fhews fhip fhip's fhore fhould fide find the Diff firft fituation fome fouth ftands ftar fteer fubtract fuch fun's Funchal furface glafs Greenwich haul horizon interfections laft lefs line of numbers logarithm maft meaſured Mercator's Sailing meridian meridian altitude Middle Latitude miles moon moon's muſt neareſt noon obfervation oppofite parallax parallel perpendicular Plane Sailing quadrant radius reprefent right line rope ſhip Sine Suppofe Table Tangent thefe theſe thip thofe thoſe true ufed uſed weft wind yards zenith
Populære avsnitt
Side 2 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, &c.
Side 16 - EXAMPLE. If the diameter of a circle be 7 inches, and the circumference 22, what is the circumference of another circle, the diameter of which is 14 inches ? Extend from 7 to 22, that extent will reach from 14 to 44 the same way.
Side 1 - ... are supposed to be divided into 360 equal parts, called degrees (marked ° ;) each degree into 60 minutes (marked ' ;) each minute into 60 seconds (marked ".) Hence a semicircle contains 180 degrees, and a quadrant 90 degrees. An Angle is the meeting of two lines in a point, as A (plate 1, fig. 2.) The point where they meet is called the angular point, and the lines AB and AC, are called sides or legs. A Right Angle is that which is made by one line perpendicular to another, or, when the angles...
Side 316 - ... home, when the rammer is to be drawn, and not before. While this is doing, the man appointed to...
Side 72 - SSE 32 miles— SSE I E. 27 miles— S. by E. 25 miles— S. 31 miles, and SSE 39 miles. Required the latitude the ship is in, and her departure from the meridian, with the course and distance to her intended port ? TRAVERSE TABLE.
Side 31 - ... SH is the complement of the arch AS ; SZ is the sine of the arch SH, or the co-sine of the arch AS. XXI. The VERSED SINE of an arch is that part of the diameter contained be*tween the sine and the arch ; thus RA is the versed sine of the arch AS, and DCR is the versed sine of the arch DHS.
Side 12 - ... line on the other side of the centre C. 6thly. From the centre C, through the several divisions of the quadrant BD, draw right lines till they cut the tangent ВТ; so will the line ВТ become a line of tangents.
Side 114 - ... These trade winds, on the American side, extend to 30, 31, or even 32 degrees of N. latitude, which is about 4 degrees farther than they extend on the African side. To the southward of the equator, the trade winds extend three or four degrees farther towards the coast of Brazil, on the American side, than they do near the Cape of Good Hope, on the African side. Between the latitude of 4 degrees N. and 4 degrees S., the wind always blows between the south and east ; on the African side the winds...
Side 16 - The solid content of any bale, box, chest, fcc. is found by extending from 1 to the breadth ; that extent will reach from the depth to a fourth number, and the extent from 1 to that fourth number will reach from the length to the solid content. EXAMPLE 1st.
Side 117 - These contrary winds do not shift from one point to its opposite all at once ; in some places the time of the change is attended with calms, in others by variable winds ; and it often happens on the...